#include <bits/stdc++.h>
 
using namespace std;
#define getbit(n, i) (((n) & (1LL << (i))) != 0) 
#define setbit0(n, i) ((n) & (~(1LL << (i)))) 
#define setbit1(n, i) ((n) | (1LL << (i))) 
#define togglebit(n, i) ((n) ^ (1LL << (i))) 
#define lastone(n) ((n) & (-(n))) 
char gap = 32;
#define int long long
#define ii pair<int, int>

#define ll long long 
#define lll __int128_t
#define pb push_back

void solve() {
    vector<ii> planes;
    int tot_area = 0;
    for (int i=0; i<4; i++) {
        int a, b;
        cin >> a >> b;
        planes.pb({a, b});
        tot_area += a*b;
    }
    
    sort(planes.begin(), planes.end());

    int possible = 0;

    do {
        
        for (int i=0; i<(1<<4); i++) {
            vector<ii> a(planes);
            for (int j=0; j<4; j++) if ( (i>>j) & 1) {
                swap(a[j].first, a[j].second);
            }
            int p = a[0].first + a[1].first;
            int q = a[1].second + a[3].second;
            int r = a[0].second + a[2].second;
            int s = a[2].first + a[3].first;
            if (p == q and q == r and r == s and p*q == tot_area) possible = 1;

            if (a[0].second == (a[1].second + a[2].second + a[3].second) 
                and (a[1].first == a[2].first and a[2].first == a[3].first)
                and (a[0].first + a[1].first == a[0].second)
                and (a[0].first * a[0].first == tot_area)) possible = 1;
            
            if (a[0].first + a[1].first + a[3].first == a[0].second and a[1].first == a[2].first and a[0].second == a[3].second
                and a[0].second == a[1].second + a[2].second and a[0].second * a[0].second == tot_area)
                possible = 1;
            
            if (a[0].second == a[1].second and a[1].second == a[2].second and a[2].second == a[3].second 
                and a[0].second == a[0].first + a[1].first + a[2].first + a[3].first and a[0].second*a[0].second == tot_area)
                possible = 1;
        }

    } while(next_permutation(planes.begin(), planes.end()));

    cout << possible << endl;
}
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);

    
    solve();
    
}